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How fast is 68 times the speed of light?

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It's about 60,000,000 times as fast as The Speed of Sound
In other words, 68 times the speed of light is 59,400,000 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 0.0000000168 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 0.000001140 times the speed of light. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 0.000004990 times the speed of light to 0.00000520 times the speed of light in water, depending on its salinity.
It's about 200,000,000 times as fast as a Peregrine Falcon
In other words, 68 times the speed of light is 189,000,000 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 0.00000000529 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 0.000000360 times the speed of light when diving. Falcons are sometimes sent to scare smaller birds away from airports to improve air traffic safety and were used in World War II to intercept carrier pigeons used by enemy forces.
It's about 200,000,000 times as fast as The CRH (train)
In other words, 68 times the speed of light is 210,000,000 times the speed of The CRH (train), and the speed of The CRH (train) is 0.0000000048 times that amount.
(a.k.a. Hexie Hao, 和谐号, a.k.a. 和諧號, a.k.a. Héxié Hào, a.k.a. "Harmony")
The CRH-3 train which runs on China's Beijing-Tianjin Intercity Railway are capable of speeds up to 0.000000320 times the speed of light. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.
It's about 200,000,000 times as fast as a Porsche 911
In other words, 68 times the speed of light is 223,000,000 times the speed of a Porsche 911, and the speed of a Porsche 911 is 0.00000000448 times that amount.
(for Porsche 911 Type 997 GT2, 2007 model)
The Porsche 911 GT2 has a top speed of 0.0000003050 times the speed of light. It takes just 7.4 seconds for the GT2 to accelerate to 0.0000001490 times the speed of light.
It's about 250,000,000 times as fast as an Arrow (archery)
In other words, 68 times the speed of light is 227,300,000 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 0.000000004399 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 0.00000029910 times the speed of light when fired from a 60-lb, 28-inch draw bow . Archeological evidence from the Ahrensburg valley near Hamburg, Germany indicates that arrows have been used since at least 11 to 12,000 years ago.
It's about 250,000,000 times as fast as a Lamborghini Gallardo
In other words, 68 times the speed of light is 230,000,000 times the speed of a Lamborghini Gallardo, and the speed of a Lamborghini Gallardo is 0.0000000043 times that amount.
(for Gallardo LP 550-2, a.k.a. Valentino Balboni, 2009 model)
The Lamborghini Gallardo LP550-2 model Gallardo has a top speed of 0.000000300 times the speed of light. The Gallardo can reach speeds of 0.0000000930 times the speed of light in just 3.9 seconds.
It's about 250,000,000 times as fast as The TGV (train)
In other words, 68 times the speed of light is 230,000,000 times the speed of The TGV (train), and the speed of The TGV (train) is 0.0000000043 times that amount.
(Train à Grande Vitesse) (for SNCF TGV Réseau, a.k.a. "Network" model, a.k.a. TGV-R) (maximum speed)
The TGV Réseau sets have a top speed of 0.000000300 times the speed of light. The train is capable of travelling the 425 km (264 mi) distance from Paris to Lyon in East-Central France in about two hours.